Practically all processes related to the development and metabolism of plants are controlled by one or more regulators of plant growth. The jasmonic acid is considered as a new phytohormone class and when applied exogenally can promote or inhibit morfo-physiological alterations. Germination and determination of the total activity of enzymes acid phosphatase and α-amilase tests were installed, with the purpose of analysing and describing the effects of different jasmonic acid doses (zero, 20, 30 and 50µM) over the soybean seed quality. The results indicated that the germination percentage decreased as the jasmonic acid doses increased. However, the total activity of acid phosphatase and α-amilase increased with the increment of jasmonic acid doses.